The Noiseblocker Black Silent Fan case fans are engineered in Germany for the utmost quality in
lowering noise outputs. This fan series is ideal for silent seekers, pro audio
professionals, and individuals who want the most silent environment possible for
where their computer is located. This fan is state of the art and engineered to
provide the highest class of silent cooling available. The NB long life advanced
sleeve bearing provides consistent smoothness and
longevity giving Noiseblocker Blacksilent fans a 3 year warranty.